According to an article published on Fastcompany.com it was Spotify that turned down the million selling album by Adele.
Fastcompany says multiple sources confirm that Adele was willing to play ball with the streaming service, as long as the content was accessible only to paying subscribers and not to its freemium users. But Spotify decided it did not want to split up its content catalog, so as to create separate music libraries for paying subscribers and freemium users.
But the split in the catalog for paying and free users is already there and has been there for years.
Here is an example of a Premium/Unlimited exclusive album (for Spotify users in the Netherlands).









